Recent research by Joanna E L’Heureux from the University of Exeter Medical School reveals a potential link between specific oral bacteria and cognitive function in older adults, particularly those with mild cognitive impairment (MCI). The study, involving 60 healthy adults and 55 MCI patients aged over 50, found that higher levels of Neisseria and Haemophilus bacteria were associated with better cognitive performance and higher oral nitrite levels, indicating potential nitric oxide metabolism benefits. In contrast, Prevotella intermedia levels correlated with poorer cognitive scores in APOE4 carriers, suggesting that certain oral bacteria may influence brain health.

Source: PNAS Nexus